NCERT Activity 2.7 Class 9 Science Explanation with a conclusion | Activity 2.7 NCERT Class9 Science Is Matter Around Us Pure
In this
post, you will find NCERT Science Class 9 Chapter 2 Activity solutions. In
Class 9 science chapter 2 Is Matter Around Us Pure consists of NCERT Activity
2.7 Class 9 Science Explanation with a conclusion.
Activity
2.7 NCERT Class9 Science Is Matter Around Us Pure
You are
suggested to study NCERT activity 2.7 class 9 science Is matter around us pure
explanation with a conclusion so that you can attempt questions based on the
activity 2.7 class 9 science. Activity 2.7 class 10 science will be very useful
for you.
Activity
2.7 Class 9 Science
·
Take a thin strip of filter paper.
·
Draw a line on it using a pencil, approximately 3 cm above the lower
edge.
·
Put a small drop of ink (water-soluble, that is, from a sketch pen or the fountain pen) at the centre of the line. Let it dry.
·
Lower the filter paper into a jar/glass/beaker/test tube containing water
so that the drop of ink on the paper is just above the water level and leave it
undisturbed.
·
Watch carefully as the water rises up on the filter paper, and record your
observation.
 |
| Chromatography |
Answer
the following questions
1.
What do you observe on the filter paper as the water rises on it?
2. Do you obtain different colours on the filter paper
strip?
3. What according to you. Can this be the reason for the rise
of the coloured spot on the paper strip?
Observation
Activity 2.7 Class 9 Science
In this method,
the solvent diffuses through the filter paper and moves upwards. When solvent
moves, it carries with the substances of the mixture present in the spot on the
filter paper.
The substances which are absorbed strongly
move slowly and on the other hand, the substances dissolved in the solvent move
at high speed.
After some
time, we find various spots on the filter paper.
Explanation
Activity 2.7 Class 9 Science
This method
is known as paper chromatography. This is used to separate colourd components
of a mixture.
This method
is based on the difference in adsorption of different components on the surface
of a solid.
Answers to the above questions
1.
When the water rises on the filter paper, the ink particles also rise with
water.
2. A dye is a mixture of two or more coloured substances so
different colours are obtained on the filter paper.
3. The rise of the
coloured spots to different heights on the paper strip due to different solubilities
of colour components in water present in the ink.
Applications of Chromatography
i. This is used to separate drugs from the blood.
ii. To separate pigments from natural colours
iii. To separate colours in dye.
Related Topics for you
1. Next Activity - Activity 2.8 Class 9 Science
2. Previous Activity-Activity 2.6 Class 9 Science
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